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 TM 5-683/NAVFAC M-116/AFJMAN 32-1083
Table 6-2. Cable maintenance--overheating problems.
Cause of overheating
Remedy
Instal lat ion
Heat from lower cables
Provide baffles to deflect
Cables in racks
in vertical racks
rising warm air.
rises and heats upper
cables.
Cables spaced
Increase space between cables.
horizontally affected
(For beat cooling, minimun
by mutual heating.
center-to-center
distance
between cables should be twice
the cable diameter).
Cables
closely spaced
If constricted portion of cable
run is short, fans can be set
or in a
location where
up to provide cooling.
heat is
confined, s u c h
as near
ceilings,
etc.
External sources of
heat.
Re-route cable or remove heat
source.
Shield cables from heat or
ventilator with fan.
Rack cables systematically and
Mutual heating of
Cables in floor
cables that have been
maintain spacing necessary to
channels.
piled aimlessly in
minimize mutual heating.
overcrowded floor
channels.
replace solid
Where practical,
Restriction of air
covers with perforated covers
circulation by solid
to increase air circulation.
covers on channels.
Overloading
Re-route part of load from
Cables in tunnels
overloaded cables to cables
carrying lighter loads.
Space cables on racks to
Place
Mutual heating of
minimize mutual heating.
cables spaced too
cables near the floor.
closely on rack.
Force air circulation
through
tunnel.
External sources of
heat.
Insulate adequately from the
external heat source.
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